Distance Traveled by Hummingbird: Solving for Height

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Homework Help Overview

The problem involves a hummingbird performing work against gravity while ascending, with specific values for mass, work done, and net acceleration. The context is rooted in physics, particularly in the areas of mechanics and energy principles.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the application of the work-energy theorem and the relationship between work done and kinetic energy. There are attempts to clarify the role of net acceleration and the conversion of mass from grams to kilograms. Questions arise about how to interpret the work done and the forces involved.

Discussion Status

The discussion is ongoing, with participants exploring various interpretations of the work-energy theorem and the components of work. Some guidance has been provided regarding the definitions of work and kinetic energy, but there is no explicit consensus on the next steps or the calculations involved.

Contextual Notes

Participants are navigating the implications of the given values and definitions, such as the distinction between work and force. There is a focus on understanding the underlying physics concepts without a complete resolution of the problem.

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Homework Statement



A hummingbird has a mass of about 1.7 g. Suppose a hummingbird does 0.15 J of work against gravity, so that it ascends straight up with a net acceleration of 1.2 m/s2. How far up does it move?

Homework Equations





The Attempt at a Solution



I don't know what to do with the net acceleration, but i do know you have to convert 1.7 g to kg...
what would the formula do you use?!
 
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What does the work-energy theorem say?
 
Wnet = delta(KE)
 
Correct. Can you find numbers/expressions for the two sides of the equation?
 
(.0017kg)(1.2m/s^2)

or

(1/2)(.0017kg)(1.2m/s)^2

I'm not sure what to do with the Joules
 
duckywucky said:
Wnet = delta(KE)

What does Wnet mean to you and how do you think you calculate it?

How about Δ(KE)? What is that all about?
 
The Wnet means to me the total work done. and is it Fnet(d)?
KE = 1/2 mv^2 for Δ(KE)?
 
Correct again. How many different works must be added up to give the total work?
 
Last edited:
is it 1.7(1.2) / .15?!
 
  • #10
You didn't answer my question. How many different works must be added up to give the total work? In other words, how many forces are doing work here?
 
  • #11
Only 1 force?! the .15 J
 
  • #12
Force is expressed in Newtons. The 0.15 J is not a force, it is the work done by the bird as stated in the problem. Now think about this: if the bird did not flap its wings and did not exert that force, would it be suspended in mid-air or would something else happen to it?
 

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